Add Dart_NewIntegerFromUint64.

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index af5f97797c174d925f6e1e89cb09d4e823b05017..7094b4be438cf137201308a8bb68600ad593f5d3 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -1399,6 +1399,16 @@ DART_EXPORT Dart_Handle Dart_NewInteger(int64_t value);
 /**
  * Returns an Integer with the provided value.
  *
+ * \param value The unsigned value of the integer.
+ *
+ * \return The Integer object if no error occurs. Otherwise returns
+ *   an error handle.
+ */
+DART_EXPORT Dart_Handle Dart_NewIntegerFromUint64(uint64_t value);
+
+/**
+ * Returns an Integer with the provided value.
+ *
  * \param value The value of the integer represented as a C string
  *   containing a hexadecimal number.
  *